public static function striplast(string:String, delimiter:*):String
{
  var pattern:RegExp = new RegExp("\\" + delimiter , "i");
  var a:Array = string.split(pattern);
  delete a[a.length-1]; 
  return a.join(delimiter);
  // turn -> path/to/folder/ into -> /path/to/
}
public static function stripfirst(string:String, delimiter:*):String
{
  var pattern:RegExp = new RegExp("\\" + delimiter , "i");
  var a:Array = string.split(pattern);
  delete a[0]; 
  return a.join(delimiter);
  // turn -> path/to/folder/ into -> /to/folder
}
public static function listlast(string:String, delimiter:*):String
{
  var pattern:RegExp = new RegExp("\\" + delimiter , "i");
  var a:Array = string.split(pattern);
  return a[a.length-1]; 
  // turn -> path/to/folder/ into -> folder
}
public static function listfirst(string:String, delimiter:*):String
{
  var pattern:RegExp = new RegExp("\\" + delimiter , "i");
  var a:Array = string.split(pattern);
  return a[0];
  // turn -> path/to/folder/ into -> path
}
public static function listGetAt(string:String, delimiter:*,index:int = 0):String
{
  var pattern:RegExp = new RegExp("\\" + delimiter , "i");
  var a:Array = string.split(pattern);
  if (index > a.length) index = a.length - 1;
  return a[index] + delimiter
  // index = 1 turn -> path/to/folder/ into -> to
}

// var fileExtension:String = StringUtils.listlast("mysoundfile.flac",".");
// output -> flac

public static function striplast(string:String, delimiter:*):String
{
  var pattern:RegExp = new RegExp("\\" + delimiter , "i");
  var a:Array = string.split(pattern);
  delete a[a.length-1]; 
  return a.join(delimiter);
}
public static function stripfirst(string:String, delimiter:*):String
{
  var pattern:RegExp = new RegExp("\\" + delimiter , "i");
  var a:Array = string.split(pattern);
  delete a[0]; 
  return a.join(delimiter);
}
public static function listlast(string:String, delimiter:*):String
{
  var pattern:RegExp = new RegExp("\\" + delimiter , "i");
  var a:Array = string.split(pattern);
  return a[a.length-1]; 
}
public static function listfirst(string:String, delimiter:*):String
{
  var pattern:RegExp = new RegExp("\\" + delimiter , "i");
  var a:Array = string.split(pattern);
  return a[0];
}
public static function listGetAt(string:String, delimiter:*,index:int = 0):String
{
  var pattern:RegExp = new RegExp("\\" + delimiter , "i");
  var a:Array = string.split(pattern);
  if (index > a.length) index = a.length - 1;
  return a[index] + delimiter
}

// var fileExtension:String = MyClass.listlast("mysoundfile.flac",".");
// output -> flac

Kinda Coldfusion string functions

String functions

ActionScript 3